I've had two children use Grades 1-3 now, and I'm very happy with this bundle. The mastery form of learning with review at the end of each chapter keeps things interesting, and for making sure that retention happening. I could usually find one or two internet links for games to help reinforce a lesson when needed based off the recommendations with the chapters. One of my children is moving on to an upper grade level and has tested a year ahead on a spiral-based curriculum, so this curriculum is more than adequate for getting ready for the next levels.
[5 of 5 Stars!]